My invidious has stopped working today (in the UK).. all the videos fail to load and the fixes (like turning on video proxy) do not fix it.. I've noticed a few piped and invidious instances having similar issues.
Probably related to the issues I began having yesterday with Revanced- suddenly, videos started to infinitely buffer after around 1 minute of playing. I ended up having to update + reinstall Revanced entirely. Looking at the Revanced subreddit it seems more and more users have started getting affected by the same issue these past few weeks.